You're at work, doing your job, and doing it well.  You've established your reputation within the team.  You're generally well liked and have good relationships.  Maybe you're in a team meeting on the next big project.  Or maybe you're just in the office kitchen grabbing an afternoon snack.  

And then, it happens.  

Somebody says something racist.  Or sexist.  Or homophobic.  Or just generally bigoted, ignorant and offensive.  

It happens to all of us.  Eventually.  If it hasn't happened to you yet, hold tight, because unfortunately, it's coming.